What is CVE-2021-46977?

CVE-2021-46977 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10. CVE-2021-46977 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-46977?

CVE-2021-46977 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-46977?

No patch is currently available for CVE-2021-46977. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-46977 actively exploited?

CVE-2021-46977 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-46977

Medium

In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Disable preemption when probing user return MSRs Disable preemption when probing a user return MSR via RDSMR/WRMSR. If the MSR holds a different value per logical CPU, the WRMSR could corrupt the host's value if KVM is preempted between the RDMSR and WRMSR, and then rescheduled on a different CPU. Opportunistically land the helper in common x86, SVM will use the helper in a future commit.

Package Linux Kernel

Published 2024-02-28

Last modified 2025-01-08

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

The following references provide additional information about CVE-2021-46977 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2021-46977

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-02-28

Modified 2025-01-08

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-46977?

CVE-2021-46977 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . CVE-2021-46977 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-46977?

CVE-2021-46977 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-46977?

No patch is currently available for CVE-2021-46977. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-46977 actively exploited?

No — CVE-2021-46977 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.